List of top Physics Questions

Polar molecules are the molecules:
A point object is placed at a distance of $60\, cm$ from a convex lens of focal length $30\, cm$. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of $40\, cm$ from it, the final image would be formed at a distance of :
A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
A car starts from rest and accelerates at $5\, m / s ^{2}$ At $t=4\, s$, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at $t =6\, s$ ? (Take $\left. g =10\, m / s ^{2}\right)$
$A$ particle moving in a circle of radius $R$ with a uniform speed takes a time $T$ to complete one revolution. If this particle were projected with the same speed at an angle ' $\theta$ ' to the horizontal, the maximum height attained by it equals $4 R$. The angle of projection, $\theta$, is then given by :
If $E$ and $G$ respectively denote energy and gravitational constant, then $\frac{ E }{ G }$ has the dimensions of:
If force $[ F ]$, acceleration $[ A ]$ and time $[ T ]$ are chosen as the fundamental physical quantities. Find the dimensions of energy.
An object is placed at a certain distance on the principal axis of a concave mirror. If the image distance (v) is 30 cm and radius of curvature (R) of the mirror is 20 cm, find the object distance (u)
If magnification is equal to one, it means
If a light ray passing through centre of curvature (C) of a mirror is incident on the mirror, the reflected ray's path is
When distance between object and screen is more than 4 times the focal length, in how many positions of the convex lens, image is sharp ?
If object and image lie on the same side of a mirror, the mirror is
Focal plane of a spherical mirror is
When a set of parallel rays of light inclined at 15° to the principal axis, are incident on a convex lens, they
To find normal to a curved surface at a point, join that point and
A proton moving with a momentum $P _{1}$ has a kinetic energy $\frac{1}{8}$ th of its rest mass energy. Another light photon having energy equal to the kinetic energy of the possesses a momentum $P _{2} .$ Then the ratio $\frac{ P _{1}- P _{2}}{ P _{1}}$ is equal to
A copper rod $AB$ of length $l$ is rotated about end A with a constant angular velocity $\omega$. The electric field at a distance $x$ from the axis of rotation is
A transistor amplifier along with a tank circuit with positive feedback will act as
In p-type semiconductors
If the mass numbers of two nuclei are in the ratio 3: 2, then the ratio of their nuclear densities is :
The ratio of the total energy E of the electron to its kinetic energy K in hydrogen atom is
1018 fissions per second is required for producing power of 300 MW in a nuclear power station. To increase the power output to 360 MW the additional number of fissions required per second is
During $ẞ^{-}$ decay of a radioactive element there is an increase in its
If the momentum of an α-particle is half that of a proton, then the ratio between the wavelengths of their de-Broglie waves is
If $θ_p$ is the polarizing angle for a glass plate of refractive index μ and critical angle $θ_c$, then